This photograph from 1918 of an army officer shows him bearing a uniform unlike any of the known national outfits. The uniform matches quite closely to that of officers in the Imperial Navy. Note the following observations:

Hat & Tunic: The uniform shown above matches the descriptions and illustrations of Imperial officers in the Star Wars universe. Though there are resemblances to the late nineteenth century German ulanka (uniform tunic), the variations in this image have never been observed previously. The hat resembles a German WWII mountain cap, but again with significant differences.

Code Cylinders (2): The photograph shows two code cylinders on either side of the front tunic flap. According to the stories, a code cylinder was a common security device used by military officers, corporate executives, and politicians. It acted as a sophisticated keycard for secure areas. Each cylinder contained its user's personal security clearance codes and data.

Rank Bars: Though the ranking system used by the Imperial Navy is unknown, a colored bar system would be affixed to the left breast of the tunic to identify the officer's level of authority.